Advances in the study of irruptive migration

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Animal Migration: A Context for Using New Techniques and Approaches (2008, background): “Several species of temperate forest seed-eating birds like crossbills, grosbeaks, and siskins are nomadic because of their reliance on cone crops or mast, which varies considerably in time and space (Newton 2006).”
Seasonal migrations of black bears (Ursus americanus): causes and consequences (2011, background): “Migrators that move in response to food scarcity are often highly mobile specialists that must leave their home area when key foods fail (Newton 2006; Fox et al 2009).”
Cues and decision rules in animal migration (2011, background): “In facultative migrations, birds only migrate long distances when food is sparse, e.g. many fi nches (Newton 2006 ) .”